Add the cubed chicken pieces to a large dish, season with salt and pepper, and set aside.
Place a large heavy bottomed pan or dutch oven over medium to high heat. Add the butter, and let it melt.
Add the chicken pieces and cook them until they start to brown.
Add the onion, and cook until transparent, then add the garlic and cook until fragrant.
Add in the tomato sauce and the ketchup, let it come to a simmer and let it simmer for 2-3 minutes.
Add the cream and simmer uncovered for 5 minutes, and serve!
